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| Control System Design for Top Pressure Selection of Ammonia Removal Tower in Morpholine Process |
SONG Nan1，ZHAO Liming2，YANG Ying1*，CAO Yubo2*
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Abstract In order to control the top pressure of ammonia removal tower in the morpholine process, a control system for selecting the top pressure was designed based on Siemens S7-300 PLC. The top pressure is controlled by condensate flow rate in normal operation. When too much non-condensing gas accumulates in the reflux tank，leading to the pressure regulating function of the condensate fails, the non-condensing gas is discharged through the venting control loop, and then the pressure regulating ability of the condensate is restored. The off-line simulation test shows that after putting in automatic control, the control program can satisfy the predetermined control requirements and switch the controller according to the limited parameter conditions. It has a good reference significance for the actual engineering transformation on the spot.
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Published: 25 January 2024
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